What is the X in X-mas?
chemical base used in making colorful dyes, 1843, coined 1841 by German chemist Carl Julius Fritzsche (1808-1871) and adopted by Hofmann, ultimately from Portuguese anil "the indigo shrub," from Arabic an-nil "the indigo," assimilated from al-nil, from Persian nila, ultimately from Sanskrit nili "indigo," from nilah "dark blue." With chemical suffix -ine (2).
aniline an·i·line or an·i·lin (ān'ə-lĭn)
An oily, poisonous benzene derivative used in the manufacture of dyes and pharmaceuticals. adj.
Derived from aniline.